Foreflight-Garmin 175 and Jeppesen subscription

[Rick7576]

I have a Garmin GPS175 and I use Foreflight on my Ipad. They talk to each other flawlessly. If I build a flt.plan on Foreflight it will send it to the Garmin.

If I load an approach into Foreflight it asks if I want to send it to the Garmin and vice a versa. 

I have a subscription to Foreflight and the database is current with NOA charts. The database on the Garmin is out of date.

So here's the question. If I load an approach into my flight plan on ForeFlight (which has the current database)  and send it to the Garmin (which is using an out of date database) will the Garmin use its database or the new information from ForeFlight ?

I dont want to have to subscribe to a Jeppesen database for the ForeFlight and the same Database for the Garmin. 

Please if you are going on speculation don't answer this question. If you know for sure the answer than thanks for your help !!

Cheers

[midlifeflyer]

I don't know if it's possible but my best guess is, it will use the approach from the Garmin. That's because, as I read the rules and the Limitations in the AFMS for your GPS175, approach procedures must be loaded from the navigation database by name. As your AFMS puts it:

Flight crews planning to fly an RNAV instrument approach must ensure that the navigation database contains the planned RNAV Instrument Approach Procedure and that approach procedure must be loaded from the navigation database into the GPS 175/GNC 355/GNX 375 system flight plan by its name. Pilots are prohibited from flying any approach path that contains manually entered waypoints.

If Foreflight is passing "XYZ RNAV (GPS) 32" to the panel as  just a series of waypoints and not as a complete procedure, it would be doing exactly what is prohibited. 

[PeteMc]

First, the Garmin is illegal to use for an Approach if the Database is not current.  Some older units (like my original IIMorrow) would allow you to check the DB to see if Waypoints were the same as on the plate, but you can't do that any more.  So you can do practice approaches, but you can't file IFR.  Some people dispute if you can even file and fly in VMC, but most things I've read says the wording is that you can't "legally" file IFR in VMC or IMC without a current DB. 

On the question of what happens if you send a FP from FF to the 175, in most cases the Wpt will be there, so it will take it  On the ones where the 175 has no clue what the Wpt is, then I *think* the 175 will just give you an error that it is not found.  But if the Name is there and it has moved for some reason, then the old 175 DB is going to fly you off in the wrong direction an ATC may be asking what's going on.  Granted, you may see on your iPad that you're off course, but then you have to decide if you follow the iPad which is not a primary flight display (only reference, not actual navigation) or do you follow your real navigation device.

For Enroute you can take the Lat/Long from the Current Chart and enter it in to the 175.  But you can't do this for an Approach, just Enroute.

 

 

Edited January 22, 2023 by PeteMc